Made from otherwise unused computer speakers, this simple battery powered setup can be employed in numerous situations where power is unavailable but music is a must. A standard headphone plug fits ipods and other electronic devices.
Step 1: Stuff
You will need to modify some aspects of these instructions depending on your model of speakers.
1 set of computer speakers-They need to run off of a 9v wall adapter.
1 computer's side panel sheet metal
1 9v battery clip
2 small screws
1 foot of wire
power drill with small and large bits for metal
dremel with grinding cone
Step 2: Getting Started
The first thing I realized when planning the build was the large length of cable connecting the two speakers. I didn't feel like cutting and splicing the wire, so I just shoved it all into the slave speaker's housing.
Step 3: Layout
The next step is to choose where to put the battery. My setup had enough space between the two speakers, so I just chose a spot in the side of the master speaker to drill a hole for the battery clip.
Step 4: Disassembly Required
Now you'll need to remove any screws from the master speaker and pull it apart. There should be an amplifier circuit and some wire in there. You'll need to identify the positive and negative soldering points of the power jack. On the bottom side of the chip, find two different soldering points under the power jack and touch the leads of a battery adapter to them. Once you figure out which is which, I recommend marking them with a sharpie. Oh yeah, don't lose the screws.
Step 5: The Clip
If you haven't done so already, drill a hole in the case where you marked earlier and insert the battery clip. Tie a knot to keep stress off of the solder joints. Now solder on some extensions so the whole thing is easier to work with.
Step 6: Tap and Assemble
Carefully solder on the battery leads, being sure not to let any uninsulated wire touch the board. Now you can try out your speakers! If it works, put the circuit back in the box and put the two halves together, but only fasten the bottom screws.
Step 7: Making the Mount
Your setup should look like this. Now it needs a mount. I decided to contour the sheet metal around the back of the speakers and install holes for a battery, audio input, and optional wall adapter. Cut a piece of sheet metal to the width of your speaker pair.
Step 8: Making the Mount (continued)
Fold a section of the metal to cover the screw holes. This point needs to be rigid.
Step 9: Making the Mount (continued)
Next you'll need to drill out the holes where the screws will be. Mark where the corner of the speakers meet the sheet and bend at a 90 degree angle. Also mark where you want your battery to go. I chose to drop it in a hole in the top.
Step 10: Making the Mount (continued)
Now you can drill four large holes on the corners of your battery opening. Use the metal shears to cut out the rest of the hole and the dremel to smooth out the shape.
Step 11: Making the Mount (continued)
Drill out holes for the audio and power and bend the sheet forward. Trim off the excess and round all edges. Install the top screws and decide where to attach the bottom of the mount.
Step 12: Making the Mount (continued)
Drill two holes for screws in the bottom of the setup and insert the screws.
Step 13: Cord Protection
Too keep the metal from cutting up your audio cord, you can cover a short length in cable insulation and wrap the section in electrical tape. Then slide the bundle into the hole in the mount. It's ugly, but it works.
Step 14: Accessories?
With the addition of this common adapter, these speakers can now amp a guitar.
Step 15: Mission Complete
Now you can blast your ABBA Greatest Hits album wherever you want!